碳化硼-碳化硼摩擦副的摩擦磨损特性研究

考察了热压碳化硼-碳化硼摩擦副在室温下的摩擦磨损特性，并采用X射线衍射仪测定了磨损表面的物相组成。结果表明：碳化硼-碳化硼摩擦副的摩擦系数随滑行距离和载荷的增加而减小，最低摩擦系数为0．09；在低载荷下初始阶段摩擦系数较高(0．3～0．4)，磨损率极低，无法用表面轮廓仪测得，磨损表面X射线衍射分析表明，在摩擦过程中接触表面发生了摩擦化学反应，生成了B2O3和H3BO3等物质，从而使摩擦系数降低。

Friction and Wear Properties of Self-mated Hot-pressed Boron Carbide Pair

The friction and wear properties of self mated B 4C under dry sliding in air were investigated on a ring on ring friction and wear tester. The worn surface of B 4C was analyzed by means of X ray diffraction so as to determine the phase composition of the worn ceramic surface. As the results, the friction coefficients decrease with increase of the sliding distance and normal load. The lowest friction coefficient is as low as 0.09, while the initial one ranges from 0.3 to 0.4. X ray diffraction analysis of the worn surface indicates that tribochemical reaction between B 4C and O 2 was involved during the friction process, with the generation of B 2O 3. The resultant B 2O 3 experienced chemical reaction with the moisture in the air to form H 3BO 3, which is responsible for the decrease of the friction coefficients and wear rate. The wear mass loss of the ceramic under the test conditions is immeasurable with a profilometer.